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What does rake db:test:prepare actually do?

I am following the rails tutorial videos and I can't figure out what the db:test:prepare command actually does. Can someone provide an explanation? ...
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Appending to an empty DataFrame in Pandas?

Is it possible to append to an empty data frame that doesn't contain any indices or columns? 3 Answers ...
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Populating spinner directly in the layout xml

Is it possible to populate the options of a Spinner right in the layout xml? This page suggests I should use an ArrayAdapter? It seems awkward not being able to do it.. ...
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Overlaying histograms with ggplot2 in R

I am new to R and am trying to plot 3 histograms onto the same graph. Everything worked fine, but my problem is that you don't see where 2 histograms overlap - they look rather cut off. ...
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How to convert timestamp to datetime in MySQL?

How to convert 1300464000 to 2011-03-18 16:00:00 in MySQL? 5 Answers 5 ...
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Is it safe to delete an object property while iterating over them?

When iterating over an object's properties, is it safe to delete them while in a for-in loop? 2 Answers ...
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How can one see content of stack with GDB?

I am new to GDB, so I have some questions: 3 Answers 3 ...
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Rails how to run rake task

How do I run this rake file in terminal/console? 6 Answers 6 ...
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What's the difference between the build and create methods in FactoryGirl?

The Factory Girl introduction delineates the difference between FactoryGirl.build() and FactoryGirl.create() : 3 Answer...
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@Column(s) not allowed on a @ManyToOne property

I have a JPA entity with a property set as 4 Answers 4 ...